Method "getWithdrawals" of signed api provides wrong method.

[smoleniuch]

There is a little typos in the Trustly_Api_Signed class

public function getWithdrawals($orderid) {

    $data = array(
        'OrderID' => $orderid,
    );

    $request = new Trustly_Data_JSONRPCRequest('getWithdrawals', $data);
        // should be
    $request = new Trustly_Data_JSONRPCRequest('GetWithdrawals', $data);
    return $this->call($request);
}